Ruah Swennerfelt, Vermont

My husband and I stopped mostly flying in 1995. We traveled a lot for our work and used Greyhound and Amtrak, with an occasional flight, when it was the only option. Now we tell people we don't fly except in a family emergency. We are strong advocates of Amtrak and encourage people to take the time, relax, read, meet new people, and give extra time for delays.

Richard Reiss, New York

I stopped flying in 2012, the day after we interviewed Klaus Lackner, a pioneer in carbon capture. This is just a minute and a half to explain why: https://youtu.be/_4KnK9hdnxw

Richard Reiss is Executive Director of The City Atlas and developed a cooperative game that shows what it takes to decarbonize NYC. It's in use at universities including Carnegie Mellon, CMU Africa, Harvard, Vanderbilt, Yale, Brown, and University College Dublin, and now also in 12 public high schools in NYC. They are working to replicate this method for every city, to help secondary schools meet the climate literacy goals of the UNFCCC Article 6 and Article 12 of the Paris Agreement.

Bethany Bretzik, Pennsylvania

The climate crisis demands immediate action from every person, family, company, and government on the planet, but most especially from those who live in wealthier countries. Recreational flying is one of the worst actions people take against the environment, due to all the emissions created by airplanes. That is why my husband and I pledge to go flight-free for the remainder of our lives. We will only travel via more sustainable methods, and we will find many amazing wonders right in our local area!